sunpy: EUI jp2 images cannot be mapped

Describe the bug

Attempting to parse an EUI jp2 file from https://www.sidc.be/EUI/data/releases/202204_release_5.0/L3/ results in an error. Traceback below.

To Reproduce

Download https://www.sidc.be/EUI/data/releases/202204_release_5.0/L3/2022/02/07/solo_L3_eui-fsi174-image_20220207T050550186_V01.jp2 or any other jp2 file Then run:

from sunpy.map import Map
Map("solo_L3_eui-fsi174-image_20220207T050550186_V01.jp2")

What happened?

>>> Map("solo_L3_eui-fsi174-image_20220207T050550186_V01.jp2")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.8/dist-packages/sunpy/map/map_factory.py", line 331, in __call__
    new_map = self._check_registered_widgets(data, meta, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/sunpy/map/map_factory.py", line 381, in _check_registered_widgets
    return WidgetType(data, meta, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/sunpy/map/sources/solo.py", line 37, in __init__
    self.plot_settings['cmap'] = self._get_cmap_name()
  File "/usr/local/lib/python3.8/dist-packages/sunpy/map/mapbase.py", line 1396, in _get_cmap_name
    str(int(self.wavelength.to('angstrom').value)))
  File "/usr/local/lib/python3.8/dist-packages/astropy/units/quantity.py", line 848, in to
    value = self._to_value(unit, equivalencies)
  File "/usr/local/lib/python3.8/dist-packages/astropy/units/quantity.py", line 802, in _to_value
    return self.unit.to(unit, self.view(np.ndarray),
  File "/usr/local/lib/python3.8/dist-packages/astropy/units/core.py", line 1135, in to
    return self._get_converter(Unit(other),
  File "/usr/local/lib/python3.8/dist-packages/astropy/units/core.py", line 1066, in _get_converter
    raise exc
  File "/usr/local/lib/python3.8/dist-packages/astropy/units/core.py", line 1051, in _get_converter
    return self._apply_equivalencies(
  File "/usr/local/lib/python3.8/dist-packages/astropy/units/core.py", line 1027, in _apply_equivalencies
    raise UnitConversionError(
astropy.units.core.UnitConversionError: '' (dimensionless) and 'Angstrom' (length) are not convertible

Expected behavior

Map is returned.

Screenshots

No response

System Details

==============================
sunpy Installation Information
==============================

General
#######
OS: Ubuntu (20.04, Linux 5.10.76-linuxkit)
Arch: 64bit, (x86_64)
sunpy: 4.0.0
Installation path: /usr/local/lib/python3.8/dist-packages/sunpy-4.0.0.dist-info

Required Dependencies
#####################
astropy: 5.0.1
numpy: 1.22.2
packaging: 21.3
parfive: 1.5.1

Optional Dependencies
#####################
asdf: Missing asdf>=2.8.0; extra == "asdf"
asdf-astropy: Missing asdf-astropy>=0.1.1; extra == "asdf"
beautifulsoup4: 4.10.0
cdflib: Missing cdflib!=0.4.0,>=0.3.19; extra == "timeseries"
dask: Missing dask[array]>=2.0.0; extra == "dask"
drms: 0.6.2
glymur: 0.9.7.post1
h5netcdf: Missing h5netcdf>=0.8.1; extra == "timeseries"
h5py: Missing h5py>=3.1.0; extra == "timeseries"
matplotlib: 3.5.1
mpl-animators: 1.0.1
pandas: 1.4.1
python-dateutil: 2.8.2
reproject: 0.8
scikit-image: 0.18.3
scipy: 1.8.0
sqlalchemy: Missing sqlalchemy>=1.3.4; extra == "database"
tqdm: 4.63.0
zeep: 4.1.0

Installation method

pip